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Dew point This calculator determines dew point from given temperature and relative humidity of air |

Boiling point of pure water at elevated altitudes This online calculator finds the water boiling temperature given the atmospheric pressure in millimeters of mercury. |

Temperature scales Conversion between different temperature scales |

Wind Chill Index This online calculator computes Wind Chill Index using Wind Chill Formula from Environment Canada |

Apparent temperature This online calculator computes the apparent temperature, taking into consideration wind speed and relative air humidity. It uses the Australian Bureau of Meteorology formula |

Saturation vapor pressure This online calculator computes saturation vapor pressure for a given temperature and atmospheric (barometric) pressure |

Relative humidity to absolute humidity and vice versa calculators The first calculator converts relative humidity to absolute humidity for a given temperature and barometric pressure. The second calculator does the opposite - converts absolute humidity to relative humidity for a given temperature and barometric pressure. Some theory and formulas can be found below the calculator. |

Density of oil Recalculation of the density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements for the density of oil. The tables for recalculation" standard |

Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure. Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure. |

Grain Drying with Natural Air Calculator to determine conditions for drying grain. |

Humindex This calculator calculates Humindex, index used by Canadian meteorologists to describe how hot the weather feels to the average person, by combining the effect of heat and humidity. |

Heat Index This calculator calculates heat index (apparent temperature), which is used by US meteorologists to determine the human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. |

Petroleum product density Petroleum product density conversion, according to GOST 3900-85 |

Quantity of heat This calculator can find missing values in the relationship between heat and temperature: heat added or removed, specific heat, mass, initial temperature and final temperature. |

Thermodynamics – calculator for solving mixing problems An online calculator to solve thermodynamic equilibrium problems, such as finding the final temperature when mixing fluids, or finding the required temperature for one of the fluids to achieve a final mixed temperature |